In The United States, Appellant vs. Moses E. Levy, Appellee, the Supreme Court was asked to decide whether or not a federal court had jurisdiction over a case involving land in Florida that was owned by an individual who had died without leaving a will. At issue were conflicting claims of title between two individuals and the U.S., which claimed it held title as part of its public lands acquired from Spain under the terms of the Adams-Onis Treaty (1819). The lower court found for Levy on grounds that he held superior title based on his possession since 1812 and prior Spanish grants; however, this decision was reversed by the Supreme Court because it found that only Congress could grant titles to public lands within states admitted into Union after 1789 and thus no valid claim existed outside those granted by Congress itself. This ruling established precedent for future cases concerning ownership disputes over public lands in newly admitted states where there is no clear chain of title or other evidence establishing private ownership rights prior to admission into union with US government holding ultimate authority over such matters until resolved through congressional action granting specific titles or otherwise disposing them according to law.

In the United States Supreme Court case of The United States v. Moses E. Levy, the court was asked to decide whether a federal tax on real estate could be imposed in Florida Territory, which at that time had not yet been admitted as a state into the Union. The majority opinion held that Congress did have this power and upheld the tax; however, Justice McLean dissented from this decision and argued that Congress lacked authority to impose such taxes in territories prior to their admission as states. He reasoned that while Congress has broad powers over territories before they become states, those powers are limited by constitutional provisions protecting citizens' rights against taxation without representation or due process of law; since Florida Territory had no representatives in Congress when it was taxed under this act, he concluded it violated these principles and should therefore be invalidated.